| Official Name: | Rentchler, Illinois |
| Settlement Type: | Census-designated place |
| Mapsize: | 260px |
| Image Map1: | Illinois in United States (US48).svg |
| Map Caption1: | Location of Illinois in the United States |
| Subdivision Type: | Country |
| Subdivision Name: |  United States |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | St. Clair |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 0.81 |
| Area Land Km2: | 0.81 |
| Area Water Km2: | 0.00 |
| Area Total Sq Mi: | 0.31 |
| Area Land Sq Mi: | 0.31 |
| Area Water Sq Mi: | 0.00 |
| Population As Of: | 2020 |
| Population Total: | 45 |
| Population Density Km2: | 55.84 |
| Population Density Sq Mi: | 144.69 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 453 |
| Coordinates: | 38.4914°N -89.8731°W |
| Area Code: | 618 |
| Blank Name: | GNIS feature ID |
| Blank Info: | 2583442 |
Rentchler is a census-designated place in St. Clair County, Illinois, United States. Its population was 34 as of the 2010 census.[2]